Core for flexible shafting



No Model.

W. D. FORSYTH. GORE FOR FLEXIBLE SHAFTING.

No. 595,708. Patented Dec. 21,1897.

Vv'itnesses. Inven tor.

Attorney.

UNITED STATES PATENT OFFICE.

VVILBER DAVID FORSYTI-I, OF PITTSBURG, PENNSYLVANIA.

CORE FOR FLEXIBLE SHAFTING.

SPECIFICATION forming part of Letters Patent No. 595,708, dated December 21, 1897.

Application filed December 21, 1896. Serial No. 616,555. (No model.)

To all whom it may con ern:

Be it known that I, WILBER DAVID FOR- SYTH, a citizen of the United States, and a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Cores for Flexible Shaftings; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to figures of reference marked thereon, which form a part of this specification.

Figure 1 is a View of a portion of a flexible shaft containing the invention, the outer covering thereof being in section. Fig. 2 is a detail side View of one of the core-sections. Fig. 3 is a longitudinal section of the same, and Fig. 4 is a perspective View.

The object of my invention is to simplify the construction of flexible shafts and to render the same capable of being readily and easily repaired in case of breakage; and the invention consists in the novel construction and combination of parts, all as hereinafter described, and pointed out in the appended claims.

Referring to the accompanying drawings, the letter A designates a length or section of shafting constructed in accordance with the invention and consisting of a flexible outer casing or covering of the usual character and a core of the particular construction now to be described. This core is built up of a series of end-jointed integral short sections 1, each of which has a central or body portion of circular form in cross-section, a hook 2, a slotted portion 3, and an end bar or pivot portion 4, which is at the opposite end from the hook, but in the same plane. To form the hooks, the sections are reduced laterally, and the corresponding sides of the slotted portions 3 are similarly reduced, in order to permit greater freedom of angular movement of the sections with respect to each other. The surfaces of the unreduced portions, including the front surfaces of the hooks, are formed on the same radii as those of the central portions of the sectionsthat is to say, said surfaces are included in and coincident with the general superficial circular plane of the sections. The ends of the hooks are convexed or rounded, as indicated at 6, and the bottom walls of the slotted portions 3 are concaved, as indicated at 7, to receive the said hooks. It will be noted that the bearing of each hook consists in a nearly circular opening, the entrance to which is bya parallel Wallslot; also, that said bearing portion is partially forward of or eccentric with relation to said slot. By this construction two sections cannot become disengaged from each other except they be brought into a certain angular relation, which is a position nearly at right angles to each other. any tendency that the sections might have to become disengaged by reason of their bowed positions when in operation.

In building up the core the hook of one section isengaged with the end or pivot bar of another section, whose hook in turn engages the bar of a third section, and so on throughout. While therefore each section may assume a position at or approaching a right This overcomes angle to the adjacent section or sections, the

planes of movement of any two adjacent sections are at right angles to each other. The rounded or circular central portion of the sections causes them to fit properly within the cylindrical non-rotary casing and gives them a proper bearing or rolling surface.

The sections can be made of bronze,.steel, or malleable castings and require no machinework in fitting them together. Each section being a duplicate of every other, repairs may be quickly and cheaply made.

Having thus described my invention, What I claim asnew, and desire to secure by Letters Patent, is

1. A core-section for flexible shafting, consisting of a short piece having a cylindrical or rounded middle portion, and reduced at each end portion upon two sides, one of such end portions being formed into a hook, and the other end portion having a slot or opening therethrough at right angles to the plane of the hook, said hook having its inner bearing portion eccentric with respect to the slot leading thereto, the unreduced surfaces of said end portions being of convex or rounded form and included inand coincident with the the section within said case or covering, the unreduoed surfaces of the said end portions being of convex or rounded form and included 15 Within the superficial plane of said middle portion, substantially as specified.

In testimony whereof I affix my signature in presence of two Witnesses.

WILBER DAVID FORSYTH.

Witnesses:

A. C. ROWAND, J12, II. II. ROWAND. 

